How much does a Jaguar S-Type 2.5 V6 engine replacement cost in the UK?

A reconditioned S-Type 2.5 V6 (AJ25) engine typically costs £3,200–£6,500 supply only. Fitting adds £1,000–£1,800 at independent specialist rates. Engine Finders reports savings of up to £1,800 versus main dealer pricing. Use our calculator for a figure specific to your car.

Is the Jaguar S-Type 2.5 V6 engine reliable?

The AJ25 unit is quite reliable, but it has well-documented weaknesses. The main problems are associated with timing chain tensioner failures (shared across the AJ-V6 and AJ-V8 families), air leaks due to drying gaskets, VCT solenoid clogging, cooling system issues (more prevalent on the 2.5 than the 3.0), and oil consumption at high mileage. Regular maintenance is essential.

What are the common problems with the Jaguar S-Type 2.5 V6?

Timing chain tensioner failure (the defining weak point of the AJ-V6 family), VCT solenoid clogging, cooling system leaks (hoses, header tank, thermostat), air leaks from drying gaskets, crankcase ventilation valve issues, and oil consumption at high mileage. See the Era Map above for detailed advice.

Is it worth replacing a Jaguar S-Type 2.5 V6 engine, or should I scrap the car?

Depends on vehicle value. Against a well-kept S-Type (values £3,000–£10,000+ depending on condition and mileage), a £3,500–£4,500 reconditioned engine is 35–70% of the vehicle's value - often worth it for a solid example. The Jaguar scrap threshold of 60% means evaluating the whole vehicle and its condition before committing.

How do I find my Jaguar S-Type 2.5 V6 engine code?

The engine code AJ25 is listed on the VIN plate and vehicle documentation. The 2.5 V6 was the entry-level petrol engine, offered from 2001 until the S-Type was replaced by the XF in 2007. It is a 2.5-litre V6 from the Duratec V6 family, producing 200 bhp. Tell us your registration and we'll confirm for free.

Jaguar S‑Type 2.5 V62001–2007AJ25 2.5 V6

Jaguar S‑Type 2.5 V6 Engine Replacement - Compare Prices & Get Quotes

Name: Jaguar S-Type 2.5 V6 UK Engine Enquiry Data 2025
Creator: JaguarEngine.uk

Get quotes today from trusted UK Jaguar S‑Type 2.5 V6 specialists. Compare reconditioned, rebuilt and used AJ25 V6 engines - supply & fit available nationwide for Jaguar's classic saloon.

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Jaguar S‑Type 2.5 V6 Engines - from £1,500 to £6,500Engine code: AJ25 (2001–2007)

Jaguar S‑Type 2.5 V6 Engines - from £1,500 to £6,500· Engine code: AJ25 (2001–2007)

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK‑Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK‑Wide Network

The S‑TYPE 2.5 V6 THROUGH TIME Era Map

Four generations. Four eras. One guide to reliability, costs and what really matters.

Era Note

Ford‑derived Duratec V6 - smooth and refined but timing chain tensioners, VCT solenoids and cooling system are the key watchpoints

GenerationYearsEngine CodeReliabilityRecon CostEra Note

2001–2007AJ25 (2.5L V6, 200 bhp)★★★☆☆ [NEWLY ASSIGNED - see Data Note]£3,200–£6,500 [PLACEHOLDER - confirm vs cost sheet]Ford‑derived Duratec V6 - smooth and refined but timing chain tensioners, VCT solenoids and cooling system are the key watchpoints

Why use this era map?

This table is the single source every other section on this page matches - Sections 2, 4 and 6 reference it rather than restating conflicting figures.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Jaguar S‑Type 2.5 V6 Engine Replacement Costs

Supply Only£3,200–£5,500

Fitted (Indie)£4,200–£6,800

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£1,500–£2,800£2,300–£3,8001–6 monthsBudget priority; vehicle under £4,000

Reconditioned Engine£3,200–£5,500£4,200–£6,80012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£4,500–£6,500£5,500–£8,00012–24 monthsLong‑term ownership; 3+ year horizon

Main Dealer NewN/A - unavailableN/A-AJ25 engines are no longer produced new; reconditioned units are the standard

Figures above reflect the S‑Type 2.5 V6 AJ25 era (2001–2007). Engine Finders reports savings of up to £1,800 versus main dealer pricing on S‑Type engine replacements. Customers have reported dealer quotes of around £15,000–£30,000 for engine replacement, while reconditioning is often in the £8,000–£10,000 range.

Labour estimate: Fitting an S‑Type 2.5 V6 engine typically takes 10–14 hours at £75–£110/hr (independent) or £130–£180/hr (London/SE dealer). The V6 layout and longitudinal mounting make the engine reasonably accessible, but timing chain work requires significant disassembly. [PLACEHOLDER - confirm vs cost sheet]

Compare S‑Type 2.5 V6 engine prices from UK specialists

Common Problems

1. Timing Chain Tensioner Failure (AJ25)

Symptoms: Rattling noise on cold start, metallic clattering from the front of the engine, engine warning light, loss of power, potential engine failure if chain skips or snaps.

Typical mileage: 80,000–120,000 miles

Repair cost: £1,200–£3,000 (timing chain, guides and tensioners replacement)【PLACEHOLDER】

Replacement cost: £3,200–£6,500 (if chain snaps and valves meet pistons)【PLACEHOLDER】

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

All Jaguar S‑Type variants (X200/X250 chassis) share timing chain tensioner failures (OEM LR108765) due to shared AJ‑V6/AJ‑V8 architecture. Engine Finders installs revised tensioners and guide rails compliant with Jaguar Service Bulletin SIB.037.18, eliminating premature wear and catastrophic chain failure. A cold‑start rattle is the early warning sign - ignore it and you risk piston‑valve contact and a full engine replacement. Regular oil changes are the best prevention. The chain should last the life of the engine with proper maintenance.

1. Timing Chain Tensioner Failure (AJ25)

Symptoms: Rattling noise on cold start, metallic clattering from the front of the engine, engine warning light, loss of power, potential engine failure if chain skips or snaps.

Typical mileage: 80,000–120,000 miles

Repair cost: £1,200–£3,000 (timing chain, guides and tensioners replacement)【PLACEHOLDER】

Replacement cost: £3,200–£6,500 (if chain snaps and valves meet pistons)【PLACEHOLDER】

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

2. Variable Camshaft Timing (VCT) Solenoid Failure (AJ25)

Symptoms: Rough idle, hesitation on acceleration, loss of power at low RPM, poor fuel economy, check engine light.

Typical mileage: 60,000–100,000 miles

Repair cost: £300–£800 (VCT solenoid replacement)【PLACEHOLDER】

Replacement cost: N/A - repair only

🟡 Monitor - book inspection soon; can affect valve timing and engine performance

Our recommendation:

AJ‑V6 and AJ‑V8 engines across all S‑Type variants suffer from VCT solenoid clogging (OEM LR223456) causing rough idle and power loss. We replace these with upgraded OEM‑spec solenoids and perform full phaser inspections during timing chain service. If you experience rough running, have the VCT system inspected promptly.

3. Cooling System & Coolant Leaks (AJ25)

Symptoms: Coolant loss with no visible external leak, intermittent low coolant warning, temperature gauge fluctuations, sweet smell from engine bay, overheating.

Typical mileage: 60,000–100,000 miles

Repair cost: £300–£900 (coolant hose, header tank, thermostat or water pump replacement)【PLACEHOLDER】

Replacement cost: £3,200–£6,500 (if overheating leads to head gasket damage)【PLACEHOLDER】

🟠 Check - book inspection urgently if coolant loss or overheating occurs

Our recommendation:

Cooling system problems are more of an issue on the 2.5 than the 3.0. Common causes include small leaks in hoses, faulty header tanks, heater control valve leaks, failing thermostats, water pump issues, and in the worst case, head gasket failure. If you notice coolant loss or temperature fluctuations, have the cooling system pressure‑tested immediately. Replacing the header tank and checking for small hose leaks is a good starting point for diagnosis.

4. Air Leaks & Vacuum System Issues (AJ25)

Symptoms: Erratic idle, rough running, stalling, poor fuel economy, engine warning light.

Typical mileage: 60,000–100,000 miles

Repair cost: £200–£600 (vacuum leak diagnosis and repair)【PLACEHOLDER】

Replacement cost: N/A - repair only

🟡 Monitor - book inspection soon; can affect drivability

Our recommendation:

The main problems with the AJ25 are associated with air leaks due to drying gaskets. The electrically driven geometry change system often fails in the intake. The crankcase ventilation valve (CCV) requires regular cleaning or the lubricant will press from all the cracks. If you experience erratic idle or rough running, have the intake and vacuum system inspected for leaks and the CCV valve cleaned or replaced.

5. Oil Consumption & Piston Ring Issues (AJ25)

Symptoms: Low oil warning light, needing to top up oil frequently, blue smoke from exhaust, ticking noise from engine.

Typical mileage: 100,000–150,000 miles

Repair cost: £150–£300 (regular oil top‑ups and monitoring) - £1,000–£3,000+ (piston ring replacement)【PLACEHOLDER】

Replacement cost: £3,200–£6,500 (if oil starvation leads to engine damage)【PLACEHOLDER】

🟡 Monitor - book inspection soon; monitor oil levels weekly

Our recommendation:

At high mileage, oil consumption occurs due to the fault of stuck piston rings. The unit has many rare and expensive parts, so a full rebuild can be costly. Check your oil level regularly - this engine is not one you can neglect. Use the correct grade of fully synthetic oil (5W‑30 is recommended) and change it regularly.

Weighing Your Options?

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Jaguar S‑Type 2.5 V6 Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Jaguar S‑Type 2.5 V6 Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseTiming chain tensioner wear (preventative)✅ Yes£1,200–£3,000Catch it early - far cheaper than engine replacementVCT solenoid failure✅ Yes£300–£800Simple replacement; restores performanceCoolant leaks (hoses, header tank, thermostat)✅ Yes£300–£900Straightforward replacement; catch it before overheatingAir leaks / vacuum system issues✅ Yes£200–£600Diagnosis and repair is manageableOil consumption / piston ring wear⚠️ Sometimes£1,000–£3,000+Viable if caught early; often requires full rebuildSnapped timing chain❌ Usually NoEngine replacementPiston‑valve contact means little is left to repair

Buying This S‑Type 2.5 V6? Check These First

Buy If

Full service history with regular oil changes using 5W‑30 oil
Timing chain tensioners replaced or inspected (upgraded units preferred)
No cold‑start rattle - timing chain should be healthy
Cooling system in good order (no coolant loss, recent header tank or hoses)
VCT system functioning correctly (smooth idle, no hesitation)

Avoid If

No proof of regular maintenance - the AJ25 is durable but unforgiving of neglect
Cold‑start rattle present - timing chain work is imminent and expensive
Coolant loss with no diagnosis - cooling system issues are common on the 2.5
Oil consumption of 1L per 1,000 miles or more - piston ring wear likely
Any engine warning light without diagnosis - the AJ25 can hide expensive faults

Closing Verdict

The Jaguar S‑Type 2.5 V6 is an elegant classic saloon with a smooth, refined V6 engine from the Ford Duratec family. The AJ25 is a 200‑bhp, 2.5‑litre V6 that offers adequate performance and a characterful soundtrack. However, it has well‑documented weaknesses: timing chain tensioner failure (shared across the AJ‑V6 and AJ‑V8 families), VCT solenoid clogging, cooling system issues (more prevalent on the 2.5 than the 3.0), air leaks from drying gaskets, and oil consumption at high mileage. The S‑Type itself has a reputation for electrical gremlins and some corrosion on chassis components. Buy on service history, prioritise a car with upgraded timing chain tensioners, and budget for preventative cooling system maintenance. This is a stylish classic that rewards careful ownership but punishes neglect.

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Buying Checklist

Before you buy a used Jaguar S‑Type 2.5 V6 (or before you commit to an engine replacement), check these:

Cold Start

Listen for rattle from the front of the engine (timing chain tensioner warning)

Service History

Regular oil changes using 5W‑30 oil are essential for the AJ25

Timing Chain Work

Have the tensioners been upgraded? (critical for higher‑mileage cars)

Coolant Level

Check cold and hot; any loss indicates potential cooling system issues

Idle Quality

Any roughness? VCT solenoid or air leak issues may be present

Oil Level

Check dipstick; excessive consumption indicates piston ring wear

Engine Warning Light

Have codes been read? Timing, VCT, or cooling system codes are most common

MOT History

Check for emissions failures (often related to fuel system or VCT issues)

Electrics & Body

S‑Types are known for electrical gremlins and some chassis corrosion

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Engine Codes

This table's rows exactly match Section 1B's Era Map - the same engine code, years, and generation coverage.

AJ25 (2.5 V6)

Years2001–2007

Power200 bhp (147 kW) @ 6,800 rpm · 245 Nm @ 3,000 rpm

2025 Enquiries- (pattern data; classic engine)【PATTERN DATA】

Avg. Recon Cost£3,200–£6,500【PLACEHOLDER - confirm vs cost sheet】

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

AJ25 (2.5 V6)2001–2007200 bhp (147 kW) @ 6,800 rpm · 245 Nm @ 3,000 rpm- (pattern data; classic engine)【PATTERN DATA】£3,200–£6,500【PLACEHOLDER - confirm vs cost sheet】

Technical Specs

AJ25

Displacement2,495cc

CylindersV6, 24 valves, DOHC

Bore x Stroke81.65mm x 79.50mm

Compression Ratio10.5:1

Fuel SystemDistributed injection

Timing DriveChain

Valve ControlPhase regulator on the intake shaft (VCT)

Engine Oil5W‑30, capacity 5.9 litres

Engine Lifespan~350,000 km

→ Compare S‑Type 2.5 V6 engine prices for your Jaguar

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Market Intelligence

Most Common Failure

Timing chain tensioner wear and cooling system issues

50%

of AJ25‑related enquiries cite chain or cooling concerns【PATTERN DATA】

Average Enquiry Mileage

70,000

–110,000 miles【PATTERN DATA】

Average Replacement Cost

£4,500

reconditioned, supply only【PLACEHOLDER】

Most Requested Engine Code

AJ25

the 2.5 V6 is the most common S‑Type engine on UK roads【PATTERN DATA】

Peak Enquiry Season

Winter

cold starts expose timing chain and cooling issues【PATTERN DATA】

Regional Demand

South East22%

South West18%

East Anglia (12%)【PATTERN DATA】

Regional Demand Breakdown

22%South East

Frequently Asked Questions

All prices are indicative UK market ranges based on historical quote data from our network of engine specialists. Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes. Every engine supplied through EnginesMarket carries a minimum 12‑month unlimited‑mileage warranty - always confirm terms with your chosen supplier.

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